Which water purifier is right for you? | Aqua Solution India on WordPress.com

A lot of people are under the misconception that reverse osmosis (RO)-based water purifiers are, in general, a better choice of water purifiers than ultraviolet (UV)-based ones.

This article explains how to decide whether to go for a RO-based water purifier or stick to a UV-based one.

Osmosis and Reverse Osmosis

RO stands for reverse osmosis. To understand how RO works, it is imperative to understand osmosis first.

Osmosis, as we learnt in school, is the flow of water molecules across a semi-permeable membrane from a region of lower solute concentration to a region of higher solute concentration.

The semi-permeable membrane above has holes, or gaps, that are large enough for water molecules to pass through, but too small for the solid molecules to move across.

In case of drinking water, solute refers to the dissolved salts and minerals such as Calcium and Magnesium that are present in unfiltered water.

RO attempts to do the opposite of osmosis, move water molecules from a region of higher solute concentration to a region of lower solute concentration. It does this by using the pressure of the incoming water to push it across the membrane, while leaving the dissolved solids and other impurities behind. The remaining water and solids are discharged through another outlet.

Source of water contamination

There are various sources of drinking water supply, such as lakes and rivers, water tankers and harvested rain water, etc. Depending on the source of water, the quality of water supplied may differ in terms of TDS levels as well as presence of microorganisms such as viruses and bacteria.

RO-based water purifiers

RO-based water purifiers use the reverse osmosis technique explained earlier to remove dissolved salts, impurities and chemicals from the water.

Apart from the core components illustrated earlier, a commercial RO water purifier may have some additional components for better filtration and performance.

  • Pressure enhancing pump
  • UV Filter
  • Carbon pre-filter

Originally published at aquasolutionwordpress.wordpress.com on May 19, 2017.

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